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Патент USA US2110977

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2,110,977
G. A. KOHOUT
FUEL FEEDING CONTROL DEVICE FOR FURNACES
Filed Sept. 25, 1933
7 Sheet's-Sheet 1
March 15, 1938.
G, A, KOHQU‘T
2,110,977
7
FUEL FEEDING CONTROL DEVICE FOR FURNACES
Filed Sept. 25, 1933
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7 Sheets-Sheet 2 I
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March 15, 1938.
2,110,977
G, A. KOHOUT
FUEL FEEDING CONTROL DEVICE FOR FURNACES
Filed Sept. 25, 1933
7 Sheets-Sheet 3
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’ Gearye QUZIZ/ZOCLZ‘
March 15, 1938.
2,110,977
G. A. KOHOUT
FUEL FEEDING CONTROL DEVICE FOR FURNACES
Filed Sept. 25, 1953
7 Sheets~Sheet 4
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March 15, 1938.
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2,110,977
FUEL FEEDING CONTROL‘DEVICE FOR FURNACES
Filed Sept. 25, 1933
'7 Sheets-Sheet 5
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G‘ A, KOHQUT
I 2,110,977
FUEL FEEDING CONTROL DEVICE FOR FURNACES
Filed Sept. 25,v 1953
- 7 Sheets-Sheet 6
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March 15, 1938.
2,110,977
a. A. KOHOUT
FUEL FEEDING CONTROL DEVICE FOR FURNACES
Filed Sept. 25, 1933
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7 Sheets-Sheet 7
Patented Mar. 15, 1938
2,110,9l'l
UNITED STAT
PATENT OFFEQE
2,110,977
FUEL FEEDING CONTROL DEVICE FOR
FURNACES
George A. Kohout, Chicago, Ill.
Application September 25, 1933, Serial No. 690,797
7 Claims. (Cl. 126-169)
My invention relates to furnaces and more par
ticularly to a control system for providing ?exible
Fig. 10 is a front View of a portion of the drive
shaft and the mechanism for conecting it to the
supervisory control of automatically operated
furnaces,
grate actuating mechanism;
In furnaces
which the feeding of fuel is
automatically stopped or started in response to
changes in boiler pressure, furnace temperature,
lapse of time or other control factors, the prob
lems of controlling the rate of feeding while the
10 feeding mechanism is in operation and the time
sequence of operating the different units of a
multiple unit feeding mechanism present certain
dif?culties.
It is a purpose of this invention to provide a
15 control system which may be used in conjunction
with automatic furnace controls to adequately
regulate the rate of fuel feeding during the pe
riod of operation of the fuel feeding mechanism.
It is also a purpose of my invention to provide
in a multiple unit fuel feeding system a novel con
trol means for maintaining a de?nite time se
quence of operation of said units which also
makes possible independent operation of any unit
at any time.
My invention contemplates also the provision
of a novel control mechanism for controlling the
length of time interval separating the a-ctuations
of the fuel feeding units.
Other and more speci?c objects of the inven
tion will appear as the description proceeds in
connection with the accompanying drawings. It
is to be understood, however, that the drawings
and description are illustrative only and are not
to be taken as limiting the invention except in
so far as it is limited by the claims.
In the drawings
Fig. l is a side view partly in section illustrat
ing a furnace of the stoker grate type to which my
invention is applied;
Fig. 2 is a sectional view substantially on the
line ‘2—2 of Fig. 1 showing the multiple fuel feed
ing units or stoker grates;
Fig. 3 is a vertical section through a part of
the control mechanism employed;
Fig. 4 is a section on the line 4—4 of Fig. 3;
5 is a section on the line 5-—5 of Fig. 3;
Fig. 6 is a section on the line 5-5 of Fig. 3;
Fig. '7 a top plan View of a portion of the top
of the control box shown in Fig, 3 illustrating the
50 control lever for setting the mechanism in the
box of Fig. 3;
Fig. 8 is a front view with the cover removed of
one of the solenoid units for connecting the drive
shaft to the various fuel feeding units;
Fig. 9 is a section on the line 9—9 of Fig. 8;
Fig. 11 is a section on the line li—|l of Fig.
10; and
Fig. 12 is a diagrammatic View illustrating the
electrical connections to the various control ele
ments for operating the fuel feeding units.
In illustrating my invention, I have applied it
to a furnace where the fuel is fed down over the
grates from the inlet by means of a series of
stoker grate units in which the grate bars are
rocked upon their pivots to move the fuel away
from the entrance. In fuel feeding devices of
this character, it is common to employ the con~
trol mechanism for stopping and starting the fuel
feeding motor in response to changes in boiler
5
pressure, and I have shown diagrammatically in
Fig. 12 the wiring connections necessary for this
purpose. I have also shown suitable connections
to a timing switch operating in connection with
the pressure switch for stopping and starting the
fuel feeding motor at intervals when the pressure
switch is open. In utilizing stoker grates of the
rocking grate type, it is also essential that when
the fuel feeding mechanism is stopped, the grates
be left in level position, and this is accomplished
by utilizing a limit switch which maintains the
motor circuit closed after the pressure switch or
the time switch has opened until the grates reach
a level position.
Such a structure is shown in 3O
my prior Patent No. 1,897,579.
My invention is directed to a device operating in
conjunction with or independently of the control
mechanism above referred to to connect and
disconnect the drive shaft to the several feeding
units.
In order that the general operation of the con
trol mechanism may be properly understood, I
will ?rst describe the control circuits shown in
Fig. 12.
Referring now to Fig. 12, the letters A, B, and
C indicate the current supply lines from a three
phase source for operating the mechanism.
These lines are brought in to a terminal board
it and connected to the line terminals LI, L2,
and L3.
This board carries a relay H which is
adapted when energized to close the contacts at
i2, i3, and id for energizing the motor. When
contact if is closed, line A is connected through 50
terminal Ll, contact if, winding of safety coil
to the motor it. When contact i3 is closed,
line B is connected through terminal L2 and con
tacts 53 to motor it; and, when contact id is
closed, line C is connected through terminal L3, 55
2
2,110,977
contacts l4, and winding of the safety coil H to
the motor.
Since contacts |2, l3, and M are all
closed by energization of relay II, it is evident
that when this relay is energized the motor will
C11
position and breaks the circuit at limit switch 23
to deenergize relay | |.
The controls just described are not in them
selves the novelty of the present application, and
The safety devices l5 and I1 normally connect
the terminals at |8 and IS in the line which
I will now describe the operation of the circuit
which controls the actuation of the stoker grates
after the motor l6 has been energized.
As shown in Fig. 12, line A is connected through
leads to the relay I!.
terminal Ll, contacts l2 and winding of safety
be started; and, if for any reason the relay is
deenergized, the motor will be stopped.
These safety devices l5
10 and I1 are merely overload relays which open
their contacts when an excessive amount of cur
rent is being drawn by the motor |6.
The terminal L| is connected through the con
tacts l8 to the relay II, and the other side of
15 the relay is connected through the contacts I!)
to terminal Cl which is directly connected to
terminal C2. The hand switch 20, which is a
three-position switch is connected directly to
terminal L3. It is evident that, if hand switch
20 is moved to connect with its upper contact, an
energizing circuit for relay H is immediately
closed from, line A through terminal Ll, con
tacts l8, winding of relay ||, contacts l9, ter
minals Cl and C2, upper contact of switch 20,
terminal L3 to line C. This would, of course,
close contacts l2, l3, and I4 and energize the
motor so that the operator may, at any time
he desires by moving the hand switch 20 to its
upper position energize the motor |6.
30
Now if the hand switch 20 is moved to its
lower contact, line C is connected through ter
minal L3, hand switch 20 to contact C3. The
contacts of pressure switch 2|. time switch 22
and limit switch 23 are connected in parallel
across contacts C2 and C3. Lines 24 and 25
lead from C3 and C2 respectively to the ter
minals of the pressure switch 2|. Lines 21 and
28 connect the opposite terminals of time switch
22 to terminals C3 and C2, respectively.
The
40 time switch is also shown with the usual ener
gizing coil 29 which is connected on one side
by the line 30 to terminal LI and on the other
side through the line 21, switch 2|], to terminal
L3 when the switch 20 is in lower position so
45 as to maintain the clock mechanism of time
switch 29 properly energized.
The limit switch 23 is connnected to terminal
C3 by line 3| and to terminal C| by line 32,
Cl being directly connected to terminal C2. This
50 places the limit switch in parallel with the pres
sure switch and the time switch across the ter
minals C2 and C3.
Now if the hand switch 20 is in lowermost po
sition, this connects line C through terminal L3
55
and switch 20 to terminal C3. Line A is already
connected to terminal C2 through terminal L|,
device |5 to line 33. Line 33 leads to terminal 10
SI of the supervisory control device 34. Line 32
connects to terminal S3 on the panel of the con
trol device 34, and this terminal in turn is con
nected by line 35 to one side of each of the
solenoids 36, 31, and 38. For the purpose of 15
clarity, I will describe the circuit controlling the
solenoids 36, 31, and 38 with the assumption that
the hand switch 20 is on its upper contact to
energize the motor l6. This places line C in
direct connection with terminal Cl and C2. 33
indicates a rotary cam switch which is directly
connected by line 40 to terminal SI and line 33
which is in turn connected to line A when the
motor is energized. The cam switch 39 has three
contacts 4|, 42, and 43 which connect through 25
the hand switches 44, 45, and 46, respectively, to
terminals S4, S5, and S6, which are in turn con
nected by lines 41, 48, and 49 to the solenoids 36,
31, and 38, respectively.
‘Thus, if the contact 40’ of the cam switch 39 30
engages contact 4 I, then switch 44, which is nor
mally closed, will direct current from line A
through terminal LI, contact I2 of relay | I, wind
ing of safety device I5, line 33, terminal SI, line
40, contacts 40', and 4|, switch 44, terminal S4,
line 41 to solenoid 36; and then over a return cir
cuit through line 35, terminal S3, line 32 to ter
minal C I, then to terminal C2 and through switch
20 and terminal L3 to line C. Solenoid 36 will
thus be energized.
Over similar paths solenoid 31 will be energized
when contact 40’ engages contact 42 and switch
45 is ‘closed, and solenoid 38 will be energized when
contact 46’ engages contact 43 and switch 46 is
closed.
I have also shown push button switches 50, 5|,
and 52 connected directly on one side to line 40
and on the other side to terminals S4, S5, and
S6 so that by manually closing switch 50 for
example when the motor I6 is running the sole
noid 36 may be operated even though contact 40'
is not in engagement with contact 4|.
The circuit over which solenoid 36 is energized
by closure of switch 50 leads from line A through
terminal Ll, contacts |2 of relay ||, winding of 55
safety device l5, line 33, terminal SI, line 40,
branch line 53, closed contact of switch 50 to
contacts I8, relay ||, contacts I9, and terminal
terminal S4, line 41, winding of solenoid 36, and
Cl.
back over lines 35 and 32 through terminals C|,
60
C2, and switch 20 to terminal L3 and line C.
Now if the automatic control devices such as
pressure switch 2| and time switch 22 are in cir
cuit, there is really no difference in the opera
tion of the devices 36, 31, and 38 as in this case,
so long as either pressure switch 2|, time switch 65
22, or limit switch 23 happen to be closed and 20
is in its lower position, the energizing circuit for
element 36 will extend from line A over the path
Therefore, if either switch 2|, 22, or 23 is
60 closed, a circuit for energizing the relay II will
be completed when the switch 20 is in its lower
most position. It is evident, therefore, that the
motor may be started by the closing of the pres
sure switch 2| assuming that the hand switch
65 20 is in its lower position, and, if pressure switch
2| is maintained open, the periodical closing of
switch 22 will also energize relay ||.
The limit switch 23, as will be brought out later,
is only open when the stoker grates are in level
70 position. The grates are, therefore, stopped in
level position, and limit switch 23 cannot start
the motor l6 from this position. However, if the
motor is operating and both switches 2| and 22
are open, the limit switch 23 will maintain the
75 motor energized until it moves the grates to level
previously described to line 33, then through the
control 34 to terminal S4 and line 41 and back 70
over line 35 and 32 to terminal Cl and from ter
minal CI to terminal C2. The circuit is com
pleted from terminal C2 in case pressure switch
2| is closed over line 25, contacts of pressure
switch 2|, line 24, terminal C3 to switch 2|] at its 75
3
2,110,977
lower. contact which connects up line C to com
plete the energizing circuit for 36. Similarly, if
the time switch 22 is closed, the energizing cir
'cuit for 36 will be closed through the lines 2'!
and 28 and the closed contacts of time switch 22.
When the limit switch 23 is closed and the other
two switches are open, the energizing circuit for
36 may be traced over the following path: From
line A, through terminal Ll, contacts l2 of relay
I I, winding of safety device l5, line 33 to terminal
10
SI of control device 34, then through the control
device 34 to terminal S4, line All to 36, back
over line 35 to terminal S3, then through closed
contact of limit switch 23 to terminal S2 and over
line 3! to terminal C3 and then to switch 28 at
its lower contact back to terminal L3 and line C.
The manner in which the solenoid devices 35,
31, and 38 may be periodically energized by the
cam switch device 39 at any time the motor is
is running will, it is believed, be clear from the
above description. Also, it is believed to be
evident that any time the motor I6 is running,
either of the devices 35, 31, or 38 may be ener
gized by pressing the corresponding push but
ton 50, 5!, or 52.
I will now describe the mechanism which is
caused to be operated by the energization of the
elements 36, 31, and 38.
I have shown my invention as applied to a fuel
3O feeding device utilizing stoker grates of the rock
ing type. These grates are indicated by the
numeral 53' (see Fig. 2) and there are three sec—
tions or units such as 54, 55, and 56 all of which
are operated from a common drive shaft 51 which
in turn is driven from motor In by means of a
disc and crank pin 58, link 59. and arm 60. Suit
able bearings 51a, 51b, and 51.0 are provided for
the shaft 51. In addition, a link 6! connects a
second arm 6|’ ?xed on the shaft 51 to a similar
arm 52 mounted on the shaft 63 which drives the
cam switch 39. The connections between the
shaft 5‘! and the three fuel feeding units 54, 55,
and 56 are the same for each unit.
These con
nections are shown most clearly by Figures 1, 10,
45 and 11. The rocking grate bars are connected
by depending arms such as 64 to the actuating
link 65 which in turn is secured to the arm 65
which is pivotally mounted upon the shaft 51. A
‘suitable sleeve bearing 5‘! serves to take the wear
50 of the arm 66 off the shaft 51. This sleeve bear
ing is secured to the member 68 which is in turn
carried by the shaft 5‘! and secured thereto by
suitable pin 69 so as to rock with the shaft.
The member 66, it will be noted, is forked at ‘m
55 to provide two arms which ?t on opposite sides
of the member 68. and a shear pin ‘H carries a
roller 12 between the two arms. The member 68
has the shoulder 13 thereon which is adapted to
engage the roller when the member 68 and shaft
60 5'! are rocked in a counterclockwise direction so as
to force the roller 12 and with it the arm 65 to
move with the shaft in this direction. Opposite
the shoulder 13 the member 68 has pivoted there
to .a pawl ‘M which in its normal inoperative posi
tion swings down by its own weight into the posi
tion shown in full lines in Fig. 11. The position
shown in Fig. 11 is that of resting position for the
fuel feeding grates, and it is believed to be
evident that, if the shaft 51 and member 58
are rocked in a clockwise direction from this
position, the roller 12 will ride between the mem
ber 58 and the pawl ‘It.
Now, if the pawl ‘M is raised up into the dotted
line position shown in Fig. 11, the same rotation
will cause the end of this pawl to engage the roller
‘i2 and thus move the arm $6 with the shaft 51
thus rocking the grates 53 to cause a fuel feeding
operation. It should be understood, of course,
that each of the fuel feeding units 54, 55, and 56
is connected to shaft El by mechanism like that
shown in Figs. 10 and 11.
The pawl W- has the heavy spring extension '55
projecting toward the furnace, and this extension
is adapted to be engaged by the depending arm To
depending from the solenoid device
When 10
the solenoid device 35 is energized, it rocks the
arm ‘if; from the full line position shown in Fig.
11 to the dotted line position shown in this ?gure.
The extension '55 then, when the shaft 51 is re
turning
a counter-clockwise direction to the 15
position shown in Fig. 11, will be caught by the
end of the arm ‘it to move the pawl "ail up into
the dotted line position shown in Fig. 11, and thus
cause the pawl to engage the roller ‘l2. It will
be noted that the end face ‘if of pawl ‘is is so
shaped that once it is pressed against the roller
'52 and held there by the force necessary to
turn the arm
it cannot fall out until the pres
sure is released or until the clockwise stroke of
the shaft 51 is completed.
The energizing of the 25
solenoid devices such as 35 is so timed with re
spect to the rocking of shaft 5? that the arm. “i6
is swung into its dotted line position while the
spring member '55 is out of the way. This timing
operation will be brought out more clearly after 30
the mechanism has been fully described. Of
course. if the arm '56 is caused by hand operation
of push button switches such as as to
to move
toward the member it when the member ‘i5 is in
the full line position shown in Fig. ll, nothing
will happen until the shaft 5? has swung far
enough to bring 75 below the end of the arm ‘is.
From the above description, it is believed to be
evident that when the solenoid device 3% is ener
gized to swing arm "68 out into the path. of the 40
spring '55, the pawl
will serve to connect the
arm
to the shaft Ell for rotation with the shaft
in a clockwise direction; and naturally the rota
tion in the opposite direction will. through the
medium of the roller ‘l2 and the shoulder 18. bring 45
the arm 65 back to the position shown in Fig. 11
on the return stroke.
The manner in which solenoid device
the arm ‘ill will now be described.
moves
Referring to Figs. 8 and 9, the solenoid device 50
36 is housed in a casing '18 which is suitably
mounted on a furnace as shown in Fig.
and
further to protect the solenoid device from the
dust and dirt around a furnace, a cover or hous
ing 19 hooks into the notch at 8%) (see Fig. 11) at 55
the top of the casing ‘l8 between the mounting
lug of the casing and the furnace wall. This
housing projects out over the device 68 mounted
on the shaft 5? and thus keeps the falling ma
terial such as particles of coal and the like from
disturbing the operating mechanism. The lower
end of the casing 3 has the recess 36 cast there
in, and the arm l8 extends up into this recess
where it is mounted upon shaft
that projects
through the walls of the recess 3 i, and is provided 65
These
at
andits35arms
opposite
to the
arepin
ends
connected
85with
which
the
bypasses
the
arms
coil
through
82'
springs
and the
lower end of the solenoid plunger 5?. The coil 70
38 is energized over the wires 35 and M connected
to the terminals such as 89 and 9d. The numeral
Qt indicates the laminated frame of the solenoid,
and the numeral 92 indicates an extension from.
the upper end of the plunger 87 which carries a 75
4
2,1 10,977
stop piece 93 of non-magnetic material to engage
the spring 94 when the solenoid plunger is raised
upon energizing of the coil 88. The purpose of
the spring 94 is, of course, to insure release of
the plunger and its downward movement when
the energizing circuit of the solenoid is broken as
otherwise the residual magnetism of the lamina
tions 9| and the plunger 81 might hold the
plunger in raised position. It is believed to be
10 evident from an inspection of Figs. 8 and 9 that,
when plunger 87 is raised, the arms 82’ and 83
will swing the arm ‘I6 into the dotted line posi
tion illustrated in Figs. 9 and 11 for engagement
with the spring ‘I5.
15
The manner in which the solenoid is energized
has already been described in connection with
Fig. 12.
I will now describe the mechanism of the con
trol device 34.
Referring now to Figs. 3 to '7 inclusive, I have
already described how the drive shaft 51 is con
nected through arm SI’, link BI and crank arm
62 to the driving shaft 63 for the control de
vice 34. The drive shaft 63 has a depending arm
25 95 (see Fig. 4) which engages an adjusting screw
96 on the frame 91 that carries the limit switch
23. The limit switch 23, as shown, is a mercury
switch in which the two contacts such as 98 and
99 are normally separated when the arm 95 is in
30 the position shown in Fig. 4. This position of arm
95 corresponds to the raised position of the arm
02 which corresponds to the level grate position of
arm 66 as shown by Figs. 1 and 11. In other
words, the limit switch 23 is open when the grates
are level.
However, when the arm 95 is moved
to the right from the position shown in Fig. 4 in
response to a downward pull on arm 62, the
weight of the frame 91 levels off the mercury
switch 23 since the frame 91 can turn about its
40 pivot at I00.
The shaft 63 has an arm IOI which is linked by
means of link I02 to the arm I03 of the clutch
device I04. Link I02 is slotted as indicated at
I02’ so that, while there is a downward move
45 ment of arm I03 in response to down movement
of arm IOI to the limiting position shown in Fig.
4, the upward movement of arm IOI does not
move arm I03 upward—the pin on arm IOI mere
ly riding in the slot of link I02. A spring I05 is
50 connected at its one end to the housing I06 of
the control device 34 and is connected under
tension at its other end to arm I03 so that it
tends to draw arm I03 upwardly at all times.
Clutch device I04 is mounted on shaft I0‘I, but
55 is free to rotate thereon. This clutch device has
mounted thereon a pin I08 which engages with
a cam I09 for adjusting the amount of rotation
which will be transmitted to clutch device I04 for
60 each movement of shaft 63 and arm IOI. Within
the ?ange III! of clutch device I04, there are
mounted a series of arms such as III, H2, and
H3 which are urged by means of the springs II4
outwardly against the ?ange IIO, these arms be
65 ing pivoted to a central member II5 that is se
cured to shaft I01 by pin II6. It will be noted
that the arms such as I II are slightly offset from
radial position so that rotation of member I04
in a clockwise direction causes these clutch arms
70 to engage or press against the ?ange H0 and
thus rotate the central member II5 with the
clutch member I04.
The shaping of the arms such as III, H2, and
H3 in order to obtain the proper clutching ef
75 fect is one that involves considerable di?iculty,
and I have discovered that by making these arms
in a certain fashion I can obtain a very effective
one-way clutch action.
The outer face of the
arm such as III is curved on the same radius as
the inner ?ange IIO so that the entire face may
engage the ?ange. One edge of this end face of
the arm is shorter than the other and the length
of the arm must be such as to permit the short
edge to approach as closely as possible to the
intersection of a radial line through the pivotal 10
axis of the rim I I0 and the pivotal axis of the
arm with the rim. In the ?gure I show the short
edge as not quite reaching such intersection as
allowance must be made for inaccuracies. This
permits the full end face of the arm to engage the 15
rim. If the arm is too short then it sticks and
won’t release, if too long it won’t grip and slides
on the rim. Since the bearing between the rim
and end of the arm is quite large it is slow to
wear and gives a long useful life. It appears 20
necessary however to follow dimensions closely.
For example, with the ?ange IIO made on a ra
dius of one and one-fourth inches and the pivot
of the arm III spaced one-half inch outwardly
from the center of the shaft I 01, the arm having 25
a one-fourth inch face to engage the ?ange IIO,
the distance from the pivot center of the arm to
the nearest end of the face of the arm that en
gages the ?ange H0 should be approximately
one-sixteenth of an inch shorter than the dis 30
tance from the pivot center to the other end of
the face. With these proportions, I ?nd that the
clutch operates very smoothly in transmitting the
rotary motion of the member I04 to the member
I I5 in one direction and releases easily to permit 35
reverse rotation of the member I84 without turn
ing the member II5.
It is believed to be evident from an inspection
of Fig. 4 that, when arm 62 is pulled down by the
link 6|, the spring I05 will be allowed to pull the 40
arm I03 upwardly and to turn the member I04
in a counterclockwise direction. The pin I08
limits the amount of this motion, however, by
striking against the cam surface on the plate I09.
Then on the reverse stroke when the arm 62 is 45
moved upwardly the arm IOI will move the disk
I04 back down to limiting position, but the
amount of movement of I04 will, of course, be
only the amount which it was allowed to move in
a counterclockwise direction by the pin I08 and 50
cam I09. In this clockwise rotation of I04, the
clutch arms cause the member II5 to rotate with
I04. By turning the cam plate I09, by means of
the ?nger piece III, the amount of rotation of
the member II5 for each rocking motion of the 55
shaft 63 can be varied over a wide range.
In
this way, angular movement of shaft I0‘! step by
step in one direction is accomplished. On the
top of the casing I00 there is an indicating plate
IIO which may be suitably marked as indicated 60
in Fig. '7 for indicating the setting of the ?nger
piece I I1.
Referring now'more particularly to Fig. 3, it
will be noted that there is a second clutch disk
I20 opposite the member I54 which is engaged by 65
arms I2I. The arms IZI are exact duplicates of
arms such as III, H2, and I I3 and make the same
angle with the radius through their pivots from
the shaft I0'I as arms III, IIZ, and H3 do. Disk
I20 is stationary, being keyed in the housing I05 70
as indicated at I22. The clutch arms I2! and disk
I20, therefore, act to prevent rotation of H5 in
a counterclockwise direction although permitting
it to rotate freely in response to the force trans
75
5
2,110,977
mitted upon clutch device I04 through the arms
Ill, H2, and H3.
The motion of the shaft I0? is transmitted
through the bushing I23 of insulating material
which is pinned to the shaft ml to a contact
carrying disk i2il also of insulating material.
This disk has the cut out notch at I25 (see Fig.
5) and the shoulder at I26 over which the con
tact member i2? is bent. The contact member
10 527 is integral with the sleeve 52'!’ which is ?xed
on the bushing i223. The disk i28, also of in—
sulating material, is rotatably mounted on shaft
till and carries a series of spring pressed contacts
iES, ltd, and 535 which correspond to contacts
iii, 42, and 43 shown in Fig. 12, the contact i2‘!
corresponding to contact 49' of Fig. 12. Suitable
terminals such as I32 and I33 are provided in
conjunction with the contacts I29, H0, and EM
for connection to the wire leads shown in Fig. 12
20 as leading from contacts 13!, 42 and #3. Disk 528
carries also an arm Hit in contact with the sleeve
i2'i’ which is also provided with a suitable ter~
minal
50, 5|, and 52 are ordinary commercial push
button switches which are adapted to close cir
cuit through them when the push buttons such
as I40 are pressed. The switches 44, ‘i5, and 45,
only one of which is shown in Fig. 4 and which
are hidden by the switches 50, iii, and 52 in Fig.
6, are also a'standard commercial switch which
are adapted to open and close their contacts in
response to movement of the levers such as I M.
Switch M and switch 50 are connected in the
manner shown in Fig. 12, and this is also true of
switches 45 and 5|, and 4E and 52. The wiring
is left off in the mechanical ?gures for the sake
of clearness. The terminal strip M2 is- the one
on which the contacts SI, S2, etc. are mounted. 15
In order to make the operation of this device
more clearly understood, I will assume that the
time switch 22 is closed and the motor I6 is
operating in accordance with the description
given of the circuit in connection with Fig. 12. 20
With the motor running, the crank 58, through
the medium of the link 59 and arm 60, rocks
for connection to the wire 48 of Fig.
the shaft 5?; and also the rocking of shaft 5'!
12. Disk 523 has an arm I35 which is connected
-25 by link i371 to the arm £38 which is pinned to
the shaft 63 so as to rock therewith. The disk i251
is moved by the shaft 5 ii? step by step in a clock
wise direction at a rate depending upon the set
ting of the cam E69, and, as it moves, the various
'30 contacts such as IE9, H36, and IS! drop down onto
through the arm 6 I ' link GI and arm 62 transmits
the contact I27 to make circuit through the cam
switching device from line 49 through terminal
i335, arm I311, contact tilt, and contact i29, I35, or
léii to the terminal (ii, 42, or 43. The action of
35 disks E25 and E28 will be best understood from
Figures 3 and 5.
Disk 92% rocks to and fro as
shaft 63 rocks, and shaft 63 rocks in time with
the rocking of shaft 5?. Disk I24, however, is
moved along by shaft It‘! step by step in the di
40 rection indicated by the arrow in Fig. 5.
The timing relation between shaft 55'? and disk
E28 will appear from Figs. 1, 4, and 5. When
shaft 57 is moved clockwise, shaft $3 is moved
counterclockwise in Figs. 1, 4, and 5, and disk I 28
45 is, therefore, also moved counterclockwise.
The disk I 24 is moved clockwise step by step
during the clockwise movement of disk 528. On
the counterclockwise movement of !28, or while
shaft 51 is moving clockwise as shown in Figs.
50 1 and 11 to move spring ‘i5 away from bar ‘iii,
the contact disk I24 is stationary. It is during
this movement that the contacts I29, etc. drop
482'.
When this point is reached, link I02 is
pulled down which causes arm M3 to rotate the
drum H34 in a clockwise direction as shown in 40
Fig. 4. The clutch arms III, H2, and H3 then
grip the ?ange IN} and cause the member II5 to
rotate in a clockwise direction thus rotating shaft
ID‘! in the same direction, and shaft I01 carries
with it the disk I24 and contact I2? mounted 45
thereon. While this action is taking place, disk
H8 is also being rocked in a clockwise direction
by arm I36, link I3l, and arm I38 which is
mounted on shaft 53.
This action will be con
disk I25 along with it for the full stroke of H23.
66.
clockwise movement of disk i228, its contact such
he next or return stroke causes the contact such
as I29 to drop off shoulder I26 into notch I25 to
thus prevent that contact from engaging i2?
again on the return stroke.
The maximum angular movement of disk E24
by drum I?fl for one step is somewhat less than
65 the angular rocking movement of disk E28, and
the contact element I2? is made of substantial
width in comparison with the distance disk 528
moves in order to insure contact on the advance
75
lill moves up, the spring m5 pulls arm 503 up
wardly to rotate drum EM in a counterclockwise
direction until the pin I08 strikes the cam sur
face of cam plate I09. Further movement of the 30
arm lilll merely causes this pin to move up in the
slot I92’ of link Hi2.
Now when the rocking motion is reversed and
arm idl is moved downwardly in response to a
downward movement of arm 62 by link 61 and 35
arm St’, the ?rst part of the movement merely
moves the pin on arm Hill to the bottom of slot
as E29 engages shoulder I21" and moves cam
55. spring 715 is out of the way. During the next
70
Rocking of shaft 25
63 causes arm MI to move up and down. As arm
tinued until one of the contacts, say I31, drops 50
down onto contact I21 during the counterclock
wise rocking movement of. I28 at which time a
circuit will be completed from wire 48 through
contact 48' which corresponds to arm I34 to
contact E21 and then to contact I3I which cor
responds to contact 133 to thus supply the current
from line A over lines 33 and 46 up to the switch
down on I2? to energize the solenoids such as
36 thus swinging bar ‘I6 at a time when the
60
a rocking motion to shaft 63.
movement of the contacts. For example, contact
I 21 is about equal in width to the distance it would
move for an an angular movement of 30 degrees
of disk 12%. The maximum angular movement
of disk I25 by drum N34 is about 30 degrees, and
the angular movement of disk I28 is about 40 de
grees.
'
Assuming that switch d6 is closed, this connects
line 49 in circuit so as to supply current to the 60
solenoid device 38. Solenoid device 38 then at
tracts its armature or core 31 pulling it upward
and causing the stop on 93 at the top thereof to
strike spring 94 and at the same time the springs
34 and 85 are caused to rotate the shaft 82 to
swing the connecting arm ‘I6 from the full line
position shown in Figs. 9 and 11 to its dotted line
position. This positions the arm ‘I6 to engage
on top of the spring ‘l5 on the return stroke of
shaft 5'5 so as to move the pawl ‘I4 up into dotted
line position as shown in Fig. 11. Then as the
shaft 5?! is rocked in a clockwise direction as
shown in Fig. 11, the pawl '54 engages roller 12
to move the arm 66 with the shaft, thus pulling
the link 65 to the left to rock the grates upwardly 75
6
2,110,977
and to feed the fuel forward on unit controlled
by the solenoid device 38.
When the shaft 51 starts back in the opposite
direction, that is when arm 60 is being pulled up
wardly, arm 62 is also being moved upwardly,
but prior to this on the clockwise stroke of shaft
51, arm 62 was pulled down which turned shaft
63 in a counterclockwise direction sufficiently to
break the contact between l3l and I2‘! by pulling
10 the tip of l3l oif into the cut-out portion I25 of
disk I24. This released solenoid device 38 and
allowed its arm 16 to fall back into vertical posi
tion. The pawl 14, however, could not become
disengaged owing to the shape of its end 11.
Going back now to the return or grate leveling
15
stroke of the shaft 51, the upward movement of
arm 80 and arm 62 by the motor causes the
shoulder 13 on member 68 to engage roller 12
and the member 14 to drop down in idle position.
20 The return stroke of the shaft, therefore, through
the medium of shoulder 13 and roller 12, pushes
the arm 66 back into the position shown in Fig. 11
thus to level the grates. During this stroke,
arms liil and I38 are pulled downward resulting
25 in further advancing the member H5 through
the medium of arm I03, disk I04, and clutch
arms lli, H2, and H3, and this by rotating shaft
in’! steps the disk I24 one step farther around
in a clockwise direction. The stepping action
30 would then continue until another contact such
as I30 dropped onto contact [2‘! when the sole
noid device 31 is energized to rock the grates con
trolled by it in the same fashion just described.
In this manner, the different fuel feeding units
35 are operated automatically in timed relation one
after the other so long as the motor remains
energized.
If at any time while the motor is energized the
operator feels that one of the feeding units should
be given an extra operation, he merely presses
the push button such as 50, 5|, or 52, mounted
thereon, and this will energize a solenoid device
36, 3?, or 38 directly from line A over line 33,
line 40, and line 53 through the contacts of the
closed switch 50, 5|, or 52 and its associated line
41, 48, or 49. The actuation of the solenoid de
vice will connect the shaft 51 to that particular
feeding unit and operate it. The manual opera
tion leaves the automatic operation undisturbed
50 as to timing, and the automatic operation then
continues in the fashion hereinbefore described.
From the above description, it is believed that
the construction and operation of this device will
be clear to those skilled in this art and the advan
55 tages thereof readily apparent.
Having thus described one speci?c form of my
drive member to said mechanism, control means
for controlling the connecting means comprising
an actuating member movable into position to
cause the connecting means to connect the drive
member to said mechanism, electro-magnetic
means for operatively moving said actuating
member, and a cam switch driven from said
drive member for periodically energizing said
electro-magnetic means.
3. In a control device for furnaces, a plural
ple the drive member to the unit, and control
means for said electro-magnetic devices com
prising a cam switch driven from said drive mem
electro-magnetic devices successively.
4. In a control device for furnaces, a plurality
of rocking grate units and a common drive mem
ber and individual connecting devices between
each unit and said member normally maintain
ing the units disconnected from the drive mem
ber, electro-magnetic devices one for each unit
each adapted when energized to cause the con
necting device for that particular unit to cou
ple the drive member to the unit, and control
her and having contacts, and circuit connec
tions connected with said contacts for successive
electro~magnetic devices.
5. In a control device for furnaces, a plurality 40
of rocking grate units and a common drive mem
ber and individual connecting devices between
each unit and said member normally maintain
ing the units disconnected from the drive mem
ber, electro-magnetic devices one for each unit 45
each adapted when energized to cause the con
necting device for that particular unit to cou
ple the drive member to the unit, and control
means for said electro-magnetic devices com
prising a cam switch driven from said drive mem
ber and having contacts, and circuit connections
cause the connecting means to connect the drive
member to said mechanism, electro-magnetic
means for operatively moving said actuating
member, a cam switch driven from said drive
member for periodically energizing said electro
70 magnetic means, and manually operable means
to energize said electro-magnetic means between
the energizations thereof by said cam switch.
2. In a furnace operating system, a drive
member, a rocking grate, a grate rocking mecha
75 nism, and connecting means for connecting the
50
connected with said contacts for successively en
ergizing the electro-magnetic devices, said elec
tro-magnetic devices each consisting of a sole
noid, a pivoted arm, and resilient means con
energized.
nism, and connecting means for connecting the
drive member to said mechanism, control means
for controlling the connecting means comprising
an actuating member movable into position to
35
ly energizing the electro-magnetic devices, and
manually operable switches for energizing said
secure by Letters Patent is:
60 member, a rocking grate, a grate rocking mecha
30
means for said electro-magnetic devices com
prising a cam switch driven from said drive mem
invention, what I claim as new and desire to
'
20
ber and having contacts, and circuit connections
connected with said contacts for energizing the
necting the solenoid and said arm for moving the
arm into operating position when the solenoid is
1. In a furnace operating system, a drive
10
ity of rocking grate units and a common drive
member and individual connecting devices be
tween each unit and said member normally main
taining the units disconnected from the drive
member, electro-magnetic devices one for each 15
unit each adapted when energized to cause the
connecting device for that particular unit to cou
55
6. In a control device for furnaces, a plurality
of rocking grate units and a common drive mem 60
her and individual connecting devices between
each unit and said member normally maintain
ing the units disconnected from the drive mem
ber, electro-magnetic devices one for each unit
each adapted when energized to cause the con 65
necting device for that particular unit to cou
ple the drive member to the unit, and control
means for said electro-magnetic devices com
prising a cam switch driven from said drive
member and having contacts, and circuit con 70
nections connected with said contacts for suc
cessively energizing the electro-magnetic devices,
said control means having an adjusting device
for varying the length of time between ener
gizations of the electro-magnetic devices.
75
2,110,977
7
7. In a control device for furnaces, a plurality
of. rocking grate units and a common drive mem
said electro-magnetic devices comprising a cam
switch driven from said drive member and hav~
ber and individual connecting devices between
each unit and said member normally maintaining
01 the units disconnected from the drive member,
electro-magnetic devices one for each unit each
adapted when energized to cause the connecting
device for that particular unit to couple the
drive member to the unit, and control means for
ing contacts, and circuit connections connected
with said contacts for successively energizing the
electro-magnetic devices, and manually operable
switches in parallel with the cam switch contacts
for energizing said electro-magnetic devices.
GEORGE A. KOHOUT.
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